/Engine/Source/Runtime/Foliage/Public/InstancedFoliageActor.h
Change all instances based on one component to a new component (possible in another level). The instances keep the same world locations
void MoveInstancesToNewComponent ( [UPrimitiveComponent](API\Runtime\Engine\Components\UPrimitiveComponent) * InOldComponent, const FBox & InBoxWithInstancesToMove, [UPrimitiveComponent](API\Runtime\Engine\Components\UPrimitiveComponent) * InNewComponent )